I was looking into hunting with totally primitive gear all made by myself and I wanted to use material in my local area(at the time NE Wa.) and luckily lived right beside a rez. so I went and asked around, they said most of their traditional bows pulled 45# max, and they confirmed the whole smaller arrowheads thing. Less then 2 fingers wide, and almost as long as the main knuckle in your index finger to the end. They hunted deer, elk, moose, all that with those bow/arrow combos. Shot placement is the key and the lighter the bow the way more accurate you can get. And obsidian and chert are much sharper then you can get steel to. Just in my experience it helps to knap your own points because they break much easier. *sorry for the late reply, currently deployed in Afghanistan